Huawei d31hw usb modem íºc Ecom logo 21 speed unlocked Hsdpa/umts (1700/2100mhz) Gsm/gprs/edge (850/900/1800/1900mhz) Support 21mbps hsdpa services Micro sd card slot Support pc voice (optional) and sms services Support data statistics Receive diversity (850/1900/2100mhz) Plug & play Support windows 2000, windows xp, windows vista and mac operating systems
